Two silver–containing polyoxometalate–based inorganic–organic hybrids as heterogeneous bifunctional catalysts for construction of C–C bonds and decontamination of sulfur mustard simulant

Abstract

The construction of C–C bonds and degradation of chemical warfare agents (CWAs) are two central organic conversions for future sustainable development. Herein, two remarkable silver-containing polyoxomolybdates-based hybrids (Ag-POMos), [Ag(L)(H2O)2]2[HPMo12O40] (1) and [Ag2(L)2]2[HPMo10V2O40]·4DMSO (2) (L ​= ​4,6-bis(2-pyridyl)-2-aminopyrimidine) were designed and prepared by using silver cation, polyoxomolybdates and multiple N-donors ligand (L). The structure of compound 1 is constructed from an independent Ag center and a keggin-type POMs; compound 2 is composed of two independent Ag centers and a keggin-type POMs, which displays intriguing POM-incorporated 1-D chain structure with hydrogen bonding. Additionally, Ag-POMos catalysts can be severed as the efficient bifunctional catalysts for the three-component Mannich reaction to achieve the construction of C–C bonds and decontamination of sulfur mustard 2-chloroethyl ethyl sulfide (CEES). As bifunctional heterogeneous catalyst, particularly compound 2, exhibits satisfying catalytic performances in the Mannich reaction (conv. 99%; sele. 99%) and the oxidation of CEES (conv. 96%; sele. 96%). Notedly, after three runs, compound 2 maintains excellent catalytic properties, demonstrating its remarkable cycling stability.